| 摘要 |
PCT No. PCT/FI85/00097 Sec. 371 Date Aug. 13, 1986 Sec. 102(e) Date Aug. 13, 1986 PCT Filed Dec. 5, 1985 PCT Pub. No. WO86/03922 PCT Pub. Date Jul. 3, 1986.The invention relates to a video compression method to be employed in connection with the conditional replenishment transmission and receiving method. In the transmitter there are detected such areas of the image that are changed with respect to the previous image, and the picture information representing the occurred changes, along with the addresses of the respective picture areas, is sent into the transmission channel. In the receiver there is reconstructed the new image on the basis of the previous image and the picture information representing the occurred changes. According to the invention, both in the transmitter and the receiver there is employed at least one reference memory (6; 14) whereinto a reference image of the transmitted picture information is stored and which reference memory is used so that whenever the transmitter recognizes a picture area to have changed, it is checked whether the changed picture information corresponds to the information stored in the respective location in the reference memory; if the answer is positive, the transmitter sends a code word informing te receiver that the required picture information must be picked from the reference memory; if the answer is negative, the picture information representing the changes occurred in the picture area is transmitted. |
